Ixabiso lombhobho wentsimbi engenamthungo weemitha ezi-6 liphezulu kunelombhobho wentsimbi engenamthungo weemitha ezili-12 kuba umbhobho wentsimbi weemitha ezi-6 unexabiso lokusika umbhobho, umphetho wesikhokelo sentloko esithe tyaba, ukuphakanyiswa, ukufunyanwa kweziphene, njl. Umthwalo womsebenzi uphindwe kabini.

Xa uthenga imibhobho yentsimbi engenamthungo, cinga ngomahluko. Umzekelo, ubukhulu bodonga lombhobho wentsimbi onobubanzi obungaphandleI-ASTM A106 GrBI-159*6 inokuba yi-159*6.2 enobukhulu bodonga obuyi-6.2 mm. Ukuba umahluko awuqwalaselwanga, intlawulo iya kuhlawulwa ngaphezulu xa ubunzima bulungisiwe. Nangona kunjalo, inkqubo yemveliso yangoku ayinakufezekisa mahluko, nto leyo ephucukileyo kakhulu kushishino lwemibhobho yentsimbi engenamthungo.

Iipayipi ezininzi zentsimbi ezingenamthungo azinamthungo ngobude. Ezinye zinokuba ziimitha ezi-8-9, iimitha ezi-8.5, iimitha ezi-8.3, okanye iimitha ezi-8.4, kodwa ungabona kwimifanekiso yeempahla ukuba zilungisiwe okanye azilungisiwe. Umzekelo, iqela elilandelayo leempahla lilungisiwe ngobude beemitha ezili-12 kwaye lenziwe kakuhle kakhulu.